Bug 205201 - overflow of DMA mask and bus mask

[Christian Zigotzky]

Hello Christoph,

I have found the issue. :-)

GFP_DMA32 was renamed to GFP_DMA in the PowerPC updates 4.21-1 in 
December last year.

Some PCI devices still use GFP_DMA32 (grep -r GFP_DMA32 *). I renamed 
GFP_DMA32 to GFP_DMA in the file 
"drivers/media/v4l2-core/videobuf-dma-sg.c". After compiling the RC7 of 
kernel 5.4 my TV card works again.

Cheers,
Christian


On 12 November 2019 at 3:41 pm, Christoph Hellwig wrote:
> On Mon, Nov 11, 2019 at 01:22:55PM +0100, Christian Zigotzky wrote:
>> Now, I can definitely say that this patch does not solve the issue.
>>
>> Do you have another patch for testing or shall I bisect?
> I'm still interested in the .config and dmesg.  Especially if the
> board is using arch/powerpc/sysdev/fsl_pci.c, which is the only
> place inside the powerpc arch code doing funny things with the
> bus_dma_mask, which Robin pointed out looks fishy.
>
>> Thanks,
>> Christian
> ---end quoted text---
>